91261271 has 2 divisors, whose sum is σ = 91261272. Its totient is φ = 91261270.

The previous prime is 91261243. The next prime is 91261273. The reversal of 91261271 is 17216219.

It is a strong prime.

It is an emirp because it is prime and its reverse (17216219) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91261271 is a prime.

Together with 91261273, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91261273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45630635 + 45630636.

It is an arithmetic number, because the mean of its divisors is an integer number (45630636).

Almost surely, 2^91261271 is an apocalyptic number.

91261271 is a deficient number, since it is larger than the sum of its proper divisors (1).

91261271 is an equidigital number, since it uses as much as digits as its factorization.

91261271 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1512, while the sum is 29.

The square root of 91261271 is about 9553.0765201583. The cubic root of 91261271 is about 450.2242026806.

The spelling of 91261271 in words is "ninety-one million, two hundred sixty-one thousand, two hundred seventy-one".